Ruby 2.4.0 is the first stable release of the Ruby 2.4 series.
It introduces many new features, for example:

Improve the internal structure of hash table (st_table) by introducing open addressing
and an inclusion order array.
This improvement has been discussed with many people, especially with Yura Sokolov.

Binding#irb: Start a REPL session similar to binding.pry

While you are debugging, you may often use p to see the value of variables.
With pry you can use binding.pry in your application
to launch a REPL and run any Ruby code.
r56624
introduces binding.irb which behaves like that with irb.

Though ISO/IEC 30170:2012
doesn’t specify details of the Integer class,
Ruby had two visible Integer classes: Fixnum and Bignum.
Ruby 2.4 unifies them into Integer.
All C extensions which touch the Fixnum or Bignum class need to be fixed.

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Virtually nowhere to be found were the 90 percent of lawyers who practice outside biglaw, the business clients who do not run mega-corporations, the access-to-justice community, or those disenfranchised from the legal system. — Five Days, Two Conferences, One Echo Chamber | LawSites https://www.lawsitesblog.com/2019/02/five-days-two-conferences-one-echo-chamber.html